1.选择题- (共1题)
1.下列关于基因突变的描述，正确的一组是（ ）
①表现出亲代所没有的表现型叫突变 ②所有的突变都是显性的，有害的 ③基因突变、基因重组和染色体变异三者共同特点就是三者都能产生新的基因 ④突变能人为地诱发产生 ⑤基因突变和染色体变异的重要区别是基因突变在光镜下看不到变化 ⑥DNA分子结构改变都能引起基因突变 ⑦基因突变的频率很低 ⑧基因突变是基因内部碱基对的增添、缺失或改变⑨基因突变有显性突变和隐性突变之分
①表现出亲代所没有的表现型叫突变 ②所有的突变都是显性的，有害的 ③基因突变、基因重组和染色体变异三者共同特点就是三者都能产生新的基因 ④突变能人为地诱发产生 ⑤基因突变和染色体变异的重要区别是基因突变在光镜下看不到变化 ⑥DNA分子结构改变都能引起基因突变 ⑦基因突变的频率很低 ⑧基因突变是基因内部碱基对的增添、缺失或改变⑨基因突变有显性突变和隐性突变之分
2.单项选择- (共5题)
2.
It was in the beautiful park____was located by the sea____we first met our new Chinese teacher．
| A．where; which | B．that; which | C．that; that | D．which; where |
3.
I’m told that languagepractising．com is a free website ______learners can not just learn
various languages but also chat online．
various languages but also chat online．
| A．where | B．which | C．that | D．what |
4.
Well, you can buy $20 tickets or 30 $ tickets, ______ you prefer．
Well, you can buy $20 tickets or 30 $ tickets, ______ you prefer．
| A．which | B．whichever | C．whatever | D．what |
5.
_____________late, he also forgot his books．
_____________late, he also forgot his books．
| A．Not only the boy turned up | B．Not only the boy turned out |
| C．Not only did the boy show out | D．Not only did the boy show up |
试卷分析
-
【1】题量占比
选择题:(1道)
单项选择:(5道)
-
【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：0
7星难题：0
8星难题：5
9星难题：0